* {
  margin: 0;
  padding: 0;
  list-style: none;
}
body,
html {
  width: 100%;
  height: 100%;
}
body {
  position: relative;
  background-image: url(../images/yinyuehui_guanzhong-007\ \(1\).jpg);
  background-size: 100% 100%;
}
.box {
  float: left;
  position: absolute;
  width: 100%;
  height: 90px;
  display: flex;
  top: 50%;
  transform: translateY(-50%);
    flex-wrap: wrap;
  justify-content: space-around;
  align-items: center;
}
.box li {
  cursor: pointer;
  font-family: 'Courier New', Courier, monospace;
  width: 90px;
  height: 100%;
  transition: all 100ms;
  text-align: center;
  line-height: 90px;
  font-weight: bold;
  font-size: 30px;
  color: white;
  border-radius: 5px;
  border: 5px solid black;
}
